CHM 1025 Murali Rangarajan
Practice Final Exam
Answers
Choose the best possible answer for each question. This is not the final exam, but it gives you an idea
of the kind of questions one can expect in the final exam
...
CHM 1025 Murali Rangarajan
Practice Final Exam
Answers
Choose the best possible answer for each question. This is not the final exam, but it gives you an idea
of the kind of questions one can expect in the final exam.
1. Expressed in μL, the volume 6.35 × 10−4 L is:
a. 63.5
b. 6.35
c. 635.
d. 0.635
e. 0.00635
2. Expressed in scientific notation, the number 1234567890 is:
a. 1.234567890 × 109
b. 1.234567890 × 108
c. 1.234567890 × 1010
d. 1.23456789 × 109
e. 1.23456789 × 108
3. Expressed in mm3, the volume 4.23 × 10−9 m3 is:
a. 4.23
b. 42.3
c. 423.
d. 0.423
e. 0.0423
4. If the density of a substance is 1.43 lb/ft3, the mass of 4.35 in3 of the substance in grams is: [1 ft = 12
in; 1 lb = 453.59 g]
a. 235.13
b. 12.43
c. 23.70
d. 1.63
e. 1.25
5. Simplified, the expression (8.9 × 105 ÷ 2.348 × 102) + 121 is:
a. 3911.46
b. 3900
c. 3910
d. 3911
e. 3911.5
6. Rounded to four significant figures, the number 0.009650901 becomes:
a. 0.009650
b. 0.00965
c. 0.0097
d. 0.009651
e. 0.00965097. Consider the following list of substances and classify each of them as an element (E), a compound
(C), a homogeneous mixture (HM), or a heterogeneous mixture (HTM): Apple juice, Chocolate
Sundae, Baking Soda (Sodium hydrogen carbonate), Sulfur, Clean Air.
a. C, HM, C, E, HTM
b. HM, HM, C, E, HTM
c. HM, HTM, C, E, HM
d. HM, HTM, C, E, HTM
e. C, HTM, C, E, HM
8. Classify the following three processes as physical or chemical changes: flammability of propane gas,
volatility of liquid propane, compression of gaseous propane into a liquid.
a. Physical, Chemical, Physical
b. Chemical, Physical, Chemical
c. Chemical, Chemical, Physical
d. Chemical, Physical, Physical
e. Physical, Physical, Chemical
9. An energy bill indicates that the customer used 955 kWh in November. How many joules did the
customer use? [1 kWh = 3.60 × 106 J]
a. 3.44 × 109
b. 3.44 × 10−9
c. 3.44 × 103
d. 3.44 × 10−3
e. 2.65 × 108
10. What is the temperature change in 500 mL of water when it absorbs 25 kJ of heat? [Specific heat
capacity of water = 4.18 J/g-°C; Density of water = 1.0 g/cc.]
a. 11°C
b. 12°C
c. 210°C
d. 4.8°C
e. 0.21°C
11. In iceboxes, ice is used to cool drinks. This is accomplished because ice melts, absorbing heat from
the drink. When ice melts, it absorbs 0.33 kJ per gram. How much ice is required to cool a 12.0-oz
drink from 75°F to 35°F, if the heat capacity of the drink is 4.18 J/g-°C? (Assume that heat transfer
is 100% efficient; 1 oz = 28.35 g)
a. 1.97 g
b. 0.84 g
c. 671.4 g
d. 18. 7 kg
e. 19.2 g
12. Acetic acid or vinegar, CH3COOH, is synthesized by the reaction of methanol and carbon monoxide.
C
Is this reaction
endothermic or exothermic? If the density of the acid is 1.044 g/mL, what is the quantity of heat
involved in the synthesis of 1.00 L of acetic acid?
H OH CO CH COOH H 3 ( ) ( ) 3 ( ) l g + → l rxn ; = 355.9 kJ/mol CH COOH . Δ − 3
a. Endothermic, + 6.19 MJ
b. Exothermic, − 6.19 MJ
c. Endothermic, + 22.29 kJ
d. Exothermic, − 22.29 kJ
e. Endothermic, + 6.19 J13. Gallium has two naturally occurring isotopes: Ga-69 with mass 68.9256 amu and a natural
abundance of 60.11% and Ga-71 with mass 70.9247 amu. Calculate the atomic mass of gallium in
amu.
a. 69.72
b. 70.13
c. 84.06
d. 55.79
e. 72.03
14. How many electrons are present in 33As3− ion?
a. 33
b. 30
c. 36
d. 39
e. 27
15. Rutherford’s experiments used a certain kind of particles on gold foil. What were they?
a. Beta-particles
b. Gamma-particles
c. Delta-particles
d. Alpha-particles
e. Eta-particles
16. The compound nickel(II) bromate has the formula:
a. Ni(BrO2)2
b. Ni(BrO3)2
c. NiBrO2
d. NiBrO3
e. Ni2BrO3
17. The compound Pb(SO4)2 is named:
a. Lead(II) sulfide
b. Lead(II) sulfate
c. Lead(IV) sulfate
d. Lead(IV) sulfite
e. Lead(II) sulfite
18. The compound (NH4)2CrO4 is named:
a. Ammonia chromate
b. Ammonia dichromate
c. Ammonium dichromate
d. Diammonium chromate
e. Ammonium chromate
19. The compound SF6 is named:
a. Sulfur hexafluoride
b. Sulfur pentafluoride
c. Sulfur tetrafluoride
d. Sulfur fluoride
e. Sulfide pentafluorine
20. The compound dinitrogen trioxide has the formula:
a. NO2
b. N2O6
c. N2O3
d. N3O2
e. N3O621. The compound phosphoric acid has the formula:
a. H2PO4
b. H2PO3
c. H3PO3
d. H3PO4
e. H3(PO4)2
22. The compound H2SO3 has the name:
a. Hydrosulfuric acid
b. Sulfuric acid
c. Sulfurous acid
d. Hydrosulfurous acid
e. Hydrogen sulfite acid
23. What is the sum of the coefficients of the following equation?
a. 9
b. 10
c. 12
d. 14
e. 16
24. The coefficients of the following equation, a, b, and c have the value:
a. 1, 2, 2
b. 1, 1, 2
c. 2, 1, 2
d. 2, 1, 1
e. 1, 1, 1
25. The sum of the coefficients of the following equation, a, b, c, and d have the value:
a. 4, 5, 5, 6
b. 4, 5, 4, 6
c. 4, 4, 4, 6
d. 6, 5, 6, 9
e. 6, 5, 6, 8
26. The sum of the coefficients of the following reaction is:
a. 15
b. 13
c. 14
d. 12
e. 16
27. Acidified water (due to acid rain, primarily nitric acid) is neutralized by a process called liming,
which is the addition of limestone (calcium carbonate) to water. The sum of the coefficients of the
balanced molecular equation of this reaction is:
a. 6
b. 5
c. 4
d. 7
e. 828. Combustion of hexane (C6H14) in air (O2) results in the formation of carbon dioxide and water. The
sum of the coefficients of the balanced chemical equation depicting this reaction is:
a. 33
b. 45
c. 31
d. 35
e. 47
29. What are the products when aqueous solutions containing 2 moles of hydroiodic acid and 1 mole of
barium hydroxide are mixed with each other?
a. 1 mole of water and 1 mole of aqueous BaI
b. 1 mole of water and 1 mole of solid BaI2
c. 2 moles of water and 1 mole of aqueous BaI2
d. 1 mole of water and 1 mole of aqueous BaI2
e. 2 moles of water and 1 mole of solid BaI
30. What is the balanced net ionic equation when aqueous solutions of sodium phosphate and copper(II)
chloride are mixed?
a.
b.
c. 3 2 3( )2( Cu PO Cu PO 2 3 + − ( ) 4 ( ) aq + → aq 4 ( ) ) s
d.
e. Correct Answer!
31. What is the balanced net ionic equation when aqueous hydrobromic acid is mixed with potassium
hydrogen sulfite?
a.
b.
c.
d.
e. Correct Answer!
32. Consider the reaction:
Which of the species is oxidized, and which is reduced? Answers are shown as (oxidized species,
reduced species).
a. K, Br2
b. KBr, Br2
c. K, KBr
d. KBr, K
e. Br2, K
33. Classify the following reaction:
a. Synthesis
b. Acid-base
c. Double displacement
d. Decomposition
e. Single displacement34. A solution contains one or more of the following ions: Ag+, Ca2+, and Cu2+. When sodium chloride
is added to the solution, no precipitate occurs. When sodium sulfate is added to the solution, a white
precipitate occurs. The precipitate is filtered off and sodium carbonate is added to the remaining
solution, producing a precipitate. Which ions were present in the original solution?
a. Ag+ and Ca2+
b. Ca2+ and Cu2+
c. Ag+ and Cu2+
d. All three of them
e. None of them
35. How many moles of O are present in 5.00 g of tin(IV) oxide?
a. 0.066
b. 0.033
c. 0.074
d. 0.037
e. 0.017
36. How many g of Cl are present in 4.35 mol of Ca(ClO2)2?
a. 154.21
b. 1.76
c. 308.42
d. 42.94
e. 2.27
37. A laboratory analysis of vanillin, the flavoring agent of vanilla, determined the following mass
percent composition of: 63.15% C, 5.30% H, and the rest O. If the molar mass of vanillin is 152.16
g/mol, the molecular formula for vanillin is:
a. C10H16O
b. C7H4O4
c. C5H12O5
d. C9H12O2
e. C8H8O3
38. How many atoms does 7.8 g of W contain?
a. 2.6 × 1023
b. 2.4 × 1025
c. 7.0 × 1020
d. 2.6 × 1022
e. 2.4 × 1023
39. A mothball, composed of naphthalene (C10H8), has a mass of 1.32 g. How many atoms of H does it
contain?
a. 4.96 × 1022
b. 6.20 × 1021
c. 1.61 × 1024
d. 5.85 × 1025
e. 6.20 × 1022
40. Iron is found in earth’s crust as the ore siderite (iron(II) carbonate). What is the mass in kilograms of
the amount of siderite that contains 1.0 × 103 kg of iron?
a. 960
b. 2100 Please note the correction! It’s 2100, not 2000.
c. 480
d. 6500
e. 1000The following five questions concern the synthesis of ammonia:
Ammonia is synthesized in a gas-phase process involving the reaction of nitrogen monoxide with
hydrogen gas. The reaction also releases water vapor as a by-product.
41. What is the sum of the coefficients of the balanced chemical equation representing the process?
a. 9
b. 10
c. 11
d. 12
e. 13
42. How many moles of ammonia can be synthesized from 6.0 mol of hydrogen gas?
a. 2.0
b. 2.4
c. 1.7
d. 15.0
e. 4.0
43. How many grams of ammonia can be synthesized from 15.0 g of nitrogen monoxide?
a. 26.4
b. 2.6
c. 136.4
d. 13.6
e. 8.5
44. If 45.8 g of nitrogen monoxide and 12.4 g of hydrogen are mixed together, which is the limiting
reactant, and what is the theoretical yield of ammonia in grams?
a. Hydrogen, 26.0
b. Nitrogen monoxide, 26.0
c. Hydrogen, 41.8
d. Nitrogen monoxide, 41.8
e. None of the above
45. If the actual yield of ammonia is 19.0 g, what is the percentage yield (in %)?
a. 160.8
b. 45.5
c. 136.8
d. 73.1
e. 63.4
Questions 46 and 47 are related to each other.
46. An emergency breathing apparatus often placed in mines or caves works via the following chemical
reaction:
If the oxygen supply becomes limited or if the air becomes poisoned, a worker can use the apparatus
to breathe while exiting the mine. The reaction involves potassium superoxide (KO2), which is much
safer to use than most oxides or peroxides. Notice that the reaction produces O2, which can be
breathed, and absorbs CO2, a product of respiration. What minimum amount (in grams) of KO2 is
required for the apparatus to produce enough oxygen to allow the user 15 minutes to exit in an
emergency? Assume that the adult consumes approximately 5.00 mg of oxygen per second of normal
breathing, and assume that sufficient CO2 is available.
a. 0.22
b. 1.52
c. 2.03
d. 3.04
e. 13.3347. If the process of respiration produces 1 mole of CO2 for every mole of O2 consumed, how much
excess CO2 (in grams) is accumulated in the mask at the end of 15 minutes?
a. 1.03
b. 3.09
c. 2.06
d. 4.12
e. 6.18
48. The Lewis structure of C2H3N is:
a. H3C−C≡N:
b. H3C−N≡C:
c. H2C=C(H)=N:
d. a and c
e. a, and b
49. Which of the following Lewis structures are acceptable?
a.
b.
c.
d. b and c only
e. a, b, and c
50. What is the molecular geometry (shape) of N2O?
a. Trigonal Planar
b. Bent
c. Linear
d. Tetrahedral
e. Trigonal Pyramidal
51. Which of the molecules are non-polar? I) H2O II) NH2OH III) CCl4
a. I only
b. II only
c. III only
d. I and II only
e. All of them are polar
52. Consider the molecule H3C−O−CH3. The shape of the molecule, around each central atom is given
by:
a. Tetrahedral, tetrahedral, tetrahedral
b. Bent, tetrahedral, bent
c. Trigonal Planar, bent, Trigonal planar
d. Tetrahedral, bent, tetrahedral
e. Bent, bent, bent53. The Lewis structure of Na2SO4 is given by:
a. Correct Answer!
b.
c.
d.
e.54. Aluminum metal reacts with oxygen gas to form aluminum oxide. How many moles of aluminum
oxide can be produced from 5.00 mol O2?
a. 10.00
b. 7.50
c. 3.33
d. 1.67
e. None of the above
55. The formula for aluminum oxide is:
a. AlO
b. AlO2
c. Al2O
d. AlO3
e. Al2O3
56. What is the symbol of the metal potassium?
a. P
b. Os
c. K
d. Pt
e. As
57. What is the formula of methane?
a. CO3
b. CH2
c. CH3
d. CH4
e. None of the above
58. Which of the following statements are inconsistent with Dalton’s atomic theory?
a. All carbon atoms are identical.
b. An oxygen atom combines with 1.5 hydrogen atoms to form a water molecule.
c. Two oxygen atoms combine with a carbon atom to form a carbon dioxide molecule.
d. Carbon and nitrogen have different sizes.
e. Helium can be split into two hydrogen atoms.
59. How many grams of N and O are present in 4.55 g of dinitrogen monoxide?
a. 1.65, 2.90
b. 1.52, 3.03
c. 3.03, 1.52
d. 2.90, 1.65
e. None of the above
60. What are the name and formula of the compound formed between indium and nitrate ion?
a. Indium nitrate, In(NO3)
b. Indium(III) nitrate, In(NO3)3
c. Indium nitrate, In(NO3)2
d. Indium nitrate, In(NO3)3
e. None of the above
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